import Utils from '../aria-utils';
import SubMenu from './aria-submenu';

const MenuItem = function (domNode) {
    this.domNode = domNode;
    this.submenu = null;
    this.init();
};

MenuItem.prototype.init = function () {
    this.domNode.setAttribute('tabindex', '0');
    let menuChild = this.domNode.querySelector('.el-menu');
    if (menuChild) {
        this.submenu = new SubMenu(this, menuChild);
    }
    this.addListeners();
};

MenuItem.prototype.addListeners = function () {
    const keys = Utils.keys;
    this.domNode.addEventListener('keydown', event => {
        let prevDef = false;
        switch (event.keyCode) {
            case keys.down:
                Utils.triggerEvent(event.currentTarget, 'mouseenter');
                this.submenu && this.submenu.gotoSubIndex(0);
                prevDef = true;
                break;
            case keys.up:
                Utils.triggerEvent(event.currentTarget, 'mouseenter');
                this.submenu && this.submenu.gotoSubIndex(this.submenu.subMenuItems.length - 1);
                prevDef = true;
                break;
            case keys.tab:
                Utils.triggerEvent(event.currentTarget, 'mouseleave');
                break;
            case keys.enter:
            case keys.space:
                prevDef = true;
                event.currentTarget.click();
                break;
        }
        if (prevDef) {
            event.preventDefault();
        }
    });
};

export default MenuItem;
